Which of the following times is NOT listed as a valid interval to check nozzle droplet size?

• A. After 100 Hours of Use
• B. Following Maintenance
• C. As Often as Necessary
• D. Weekly Checks

Answer: (D)

Droplet size checks are tied to practical events that affect nozzle performance, like wear, maintenance, or changing field conditions. The listed intervals—after a defined amount of use (such as 100 hours), after maintenance, and as often as necessary—reflect situations where drift and efficacy can change due to wear, cleaning, or calibration adjustments. A fixed weekly schedule isn’t mentioned because droplet size can drift irregularly and may not require weekly checking unless those events or needs occur. Checking after 100 hours of use ensures you catch wear effects; checking after maintenance verifies components are still within spec; checking as often as necessary covers situations where conditions demand it. Weekly checks aren’t part of the approved intervals, so they aren’t considered a valid default interval in this context.